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Share-Based Compensation Plans - Summary of Activity Related to Stock Options Granted Under Company's Incentive Plan (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Shares outstanding, beginning balance 4,964 4,026 3,350
Total Shares, granted    1,250 922
Total Shares, exercised (611) (140) (144)
Total Shares, forfeited, canceled or expired (124) (172) (102)
Total Shares outstanding, ending balance 4,229 4,964 4,026
Total Shares, exercisable 2,345    
Total Shares, available for issuance 2,772    
Weighted Average Exercise Price per Share Outstanding, beginning balance $ 14.47 $ 14.24 $ 12.30
Weighted Average Exercise Price per Share, granted    $ 15.34 $ 21.29
Weighted Average Exercise Price per Share, exercised $ 13.16 $ 12.00 $ 12.12
Weighted Average Exercise Price per Share, forfeited, canceled or expired $ 17.63 $ 17.29 $ 17.45
Weighted Average Exercise Price per Share Outstanding, ending balance $ 14.57 $ 14.47 $ 14.24
Weighted Average Exercise Price per Share, exercisable $ 13.44    
Weighted Average Remaining Contractual Term (Years), Outstanding 6 years 8 months 16 days    
Weighted Average Remaining Contractual Term (Years), Exercisable 6 years 2 months 19 days    
Aggregate Intrinsic Value, Outstanding $ 37,637    
Aggregate Intrinsic Value, Exercisable $ 23,524